package com.sykuku.common;

import com.baomidou.mybatisplus.core.toolkit.IdWorker;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

@RestController
@Slf4j
@RequestMapping("/common")
public class FileController {
    //配置文件中自定义配置的下载路径
   @Value("${reggie.path}")
    private String basePath;

   @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

       log.info("用户开始上传文件{}",file.toString());

       //原始文件名
       String originalFilename = file.getOriginalFilename();

       String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

       //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖雪花算法ID
       String fileName = IdWorker.get32UUID() + suffix;

       //新建一个目录对象

       File dir = new File(basePath);
       if (!dir.exists()){
           dir.mkdirs();
       }

       try {
           file.transferTo(new File(basePath+fileName));
       } catch (IOException e) {
           throw new RuntimeException(e);
       }
       log.info("用户开始上传文件成功");
       return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        log.info("回显上传的数据{}",name);
        try {
            FileInputStream inputStream = new FileInputStream(new  File(basePath+name));

            ServletOutputStream outputStream = response.getOutputStream();

            int len= 0;//代表长度 读取文件 readline读取字符串
            byte[] bytes = new byte[1024];
            while ((len=inputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            inputStream.close();

        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }

}